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A045987 as a simple table

na(n)
011
112
214
318
41116
51312
61614
7111218
8121516
9151112
1011101214
1112101418
1214101916
1318111912
141116131814
151312171618
1616251316
17111311101712
181216121124
191512141228
2011101418151716
2112101917111512
2214111914131014

[11,12,14,18,1116,1312,1614,111218,121516,151112,
 11101214,12101418,14101916,18111912,1116131814,
 1312171618,16251316,111311101712,1216121124,
 1512141228,11101418151716,12101917111512,
 14111914131014]